Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b85f738a500009ed08f4090b48ba58a2a3d3e3609d7b4411d0b913bc48c5dc' 
  AND token = 'AgRQlz+gQA4pQcmOFT/+cwMQ0ZUYbXOmEmlzBReFvlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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