Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b499c0da31de22b7eedcdc52f1a5792ba10d95a0c144941fe62d2f4f52ebb53' 
  AND token = 'O/QIXLPNl+7/ABscCwn1CBqYo2nBZtdmYFKe1YVJatQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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