Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bcb559dad3a7b3f1a90f1066585bc5a10d01fd244b330671fbad51813302e8d' 
  AND token = '5QaPH/8dhN3+X8jfolMXXU7yXrkFPt7EraLOS6csl80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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