Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b12fefd71b893365c62c98d7f5fc9eeb202b098705d35d43a45ebc41cbd83c3' 
  AND token = 'mpyXcgNiSA3gtajswMCllvxFnwXAkcOKC1zpopjQ9Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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