Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f890b136fe215d82699d402c19b3835d5813dd255be7344f3690f192b5e65d64' 
  AND token = 'MVr5Xmfc7qW5Avc0zhCStV+4ny0g4rnoyFqdTO1ZWYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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