Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3756f85ae21ab4575140c6e29fe4de2f7ab5a9c39bafa6ffd77eaafce4f811' 
  AND token = 'cylbPbMBSchWFlzyUn9OSOfO9wop+c79xLQnynPhO+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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