Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c298f0e80aa2ba5cae3d187af96f3d4eca26b1595868d0a4669a79a8cdd9045e' 
  AND token = 'G+drHZuH+ONcH4PiLSuhS+LuFqC66OEkNjsl8wqg5bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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