Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af0490f1baf66b40b00afd0c2bc16fba9ddb23c6ce40d68cd1efaf19425ae9a8' 
  AND token = 'veylAhq6Y8zfPQY1B3stjgUumdTHC/KL9rtb4/NmTs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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