Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54d224e71a27acd9f68ef1ac92fb602bf59276e5acaa9da45a684227be8c3947' 
  AND token = 'oA6r9cYeRHe8ZDefzjkOfDszJDJ7ZWFlHjGd5mDsfpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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