Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9388b08b56c8fcbe8b2956b164ebcdc80326e0e7690342a51ae1695c7ebe49' 
  AND token = '/6q+tBi7mmebZxWqcD3Ns15xd5FWAGpXtBEhMpI03nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}