Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee90e3dc43069a4b565451f54dd8a702ef4b66935b5a7ef2e3cb0e3e9c4a04f' 
  AND token = 'N7f+1510qyF8pSTJ99xnEHAA+A4Ydm8T4XArT3hgyPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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