Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e9677b7efe4b180507d9f5ed09f0c324237235958e7dabb1b7b174af855a059' 
  AND token = '5jGwUZ77wJUWHG0rVqT9tEaKExb6HofHeY+zVYtOkA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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