Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f721e4c9ae7a88857c03d2c927a5b319fe87dfa340e5ba6d1da59f676d1b3a61' 
  AND token = 'fCjPFyc+Dt0fAA4tUF9dgVbFoY3NNoB359qIs1HAD/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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