Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acba646470ddec96671133e262133eb8a2c33061df791795e62f13f733e85c21' 
  AND token = 'lRTUpwSMfM9rkdQHQ9YuV5okUaW432HQdh0/Bf7KbSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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