Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49812f38ac4802c3863a64b6bcff5feecba1ee2d50af253174b52425545b298d' 
  AND token = 'Nq5DCHPeO9FOiWw64YiQTgfIUSuX7+X8ryuR9nLMDEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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