Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77af070bac50b17b1cf997636197a7035bd3c9d78d055601dcf05b904d2daf7e' 
  AND token = '7hTnLDCzslyNflOGsL6wRVedxd9JfALZ7rzgna3U/jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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