Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe14b437c46475d8b12c6424043f2542afbc195e55189864e39c17a66d530274' 
  AND token = '5AF504Xcb5n2hx2MK3kLHY2RflpfsW9dhtnJNxSYlRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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