Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd794c5e4a52bbe562bbf242ec41f6e2d7ccbd2bcfa8a1d5bc2ec71789908a35c' 
  AND token = 'csOqFHN1+j/mcyDsr7HVQv7QIyleX7rX4a69FxJN4cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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