Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7eba6f1b3f9158688c28b5ee840abf6b3a645f6650c02ad64ba9aa1f856ab5f' 
  AND token = '6t3JJGyNfcVv5wr2qRzcSz+ESMDDR7FxMvIDfJrHH4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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