Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21bfe33de19359cc6f9525382ce894e196a6adf91ee8dc2e821529c10fe76d6c' 
  AND token = 'EvhfBzooncu5TUe9rLxSgfUOezUyCkTijm9BrWudSHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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