Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8b9ab006849d997d4a7a8056ee44b6d78ee051cdb2e1a21a80551a9dda0ff7' 
  AND token = 'D1KWblcZc0PYOLPkd8octC/ZF2Hm+t6GF1TO/7cj3JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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