Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5b16d872f05e534e8e41c39c1021c1f6cedce00dbf340444edad9e6f452a1b' 
  AND token = 'mxyFKti3XOZPmaVGoJuuC8pcEAmlv1rdTGDYqtXM/lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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