Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd7452452b2e6a9a59484e8ae1487782026f5316c35964515818fb3f6011c28' 
  AND token = '34X6TY/kEeQn/0+bBJ0bqTmgGlN+4OBEkVsRbQCTp7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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