Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3780c91fce856d407d0e71b3eec5cdabee7cddd15b599e2f98e7d193d5f1116c' 
  AND token = 'f6gNtbofqJfTCTIliN29Ld5m6y4ecvgfrkyNvi0AFNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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