Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6471df669475c4c65b39c9edd51e3e3871b6c6c0f20c785467bc78893e4328bf' 
  AND token = 'uEtk1CkZtR8+SOCVFaIr5CNqsozouFncLnwK9p9xjbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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