Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed837ab4d14b0ba0569f99c86d5e154cd750a2c59b780beb4bcb32ee3da47c27' 
  AND token = 'UN9BOIeD7ju1+oEcLI4vMRLkclO+MSFmH/tzlvNs7ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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