Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d51ab7f13640085aebe2a822bc40c88b809a252b0e3b11fd15ed5b2d5bcd4ce' 
  AND token = '4A4oRZzMFsUakFcAXbzjKfRVB8OTBT9Q6xCnxyhi7p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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