Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c49ce07e6107625ab4f58fd257c8260a29e8aaafe239fafcc7675a0e7a048428' 
  AND token = 'Xya5X2Fpd7YKnCWFHfGTgg5KRmWSAH3EYsTM8MxV+Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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