Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee3a8a8b425caf380ced13bbec1b5c6b2b375c56956dfcbca1bd139803e0d3f4' 
  AND token = 'qAzGadr7qkEVEf/eCHPHv0ARRjto++aU4d6B+ZwwRnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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