Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df1a5b57d76e552f9a955fa286479ae9a8164cf73af70f0811ad31842b244bfa' 
  AND token = 'cVjV1KbbkBFsbJukIv2DD9PCNkb8qK4Y4/yjJQAuR3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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