Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb61ddf90570ac96a9c352446b9155d5c3be85bde2f5f69af5d2c2bd6f8d5a87' 
  AND token = 'nKa16JJAnz6pB3FQItKyFk5zs/3qMLMjJB0FGmJbw0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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