Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '081f813625124c37b210da5dc2e251fd93ddd49c4cb6b6d0fb7c43e24d5a53b3' 
  AND token = 'LiBHb6cgHGfwv+CsoLLiFFWFHSzXTMpNv7H2Yrz2n8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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