Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d761d3ba6c8e2cb0216f37066fb9fa2347e942d3f9eb599650f38e529071f1a' 
  AND token = 'vLr2kgtnRd1iG+paCFGGqN1E0j2PhkCc0gBLaLjhlKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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