Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83ef828af6d3c17444d939472d46e026e94ea8b4e3a34ac3e2e1337770d9c24' 
  AND token = 'L3d8fpO9oJHTi83O5vqE47nbf/z9ta1IU10mQ7vU1xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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