Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d7fb5c94aefd69c3efac7e169acaf41bdfb2216771848fe5d229ab37ebf4ee8' 
  AND token = 'gVqcLd69Y7AFV6daVdbLmMa3jZOEeflCcuu/lVWPNc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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