Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29008553d887a25f137e10fae87ecf798e1f4310579795efb03a9b7772251946' 
  AND token = 'YacH11v4ibK9pviC6gRpzBua7aCbEOSNPz72eOPk31Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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