Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7dbc8cacfc43fc892e342b530df03fd9847d198073c4f9185924badb0c6f16' 
  AND token = 'OFeOkBTBCQW6XYLv7S2SRc1AEOmUhb140w67IpUvOlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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