Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5520cd68cec0ed5f83d663ed110bd731e73e6400962cc69f80bd3aca3524f6c' 
  AND token = 'FI5d/45SHee6tbx7zL1Pbu59XGD7j0z4QINekMR0XUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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