Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9bb2a6a2f3dda0f0c104a239fdb536b8691cf9412a6b32904dba5e99e1fd83b' 
  AND token = 'UF7x9HMpPKJEMNrsGMTa+ch+Z9qf0ebAlkwR0/nqB68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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