Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830df15c017976a21837851bc21201365c2196311fdd8aae71a612e55feed933' 
  AND token = '9/FUsrucA4NUK59x9u3ycwPWq4cb/XRP8ESygJbauHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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