Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab78f8171dea6116d663f79348915dc30260c65121ce40f3e634c8d0c1b39d8e' 
  AND token = 'hUrFZuAaA6dtoTpfvd+pOcvkbbe7Yuu1SNIzLyas0IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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