Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3625e8da6ee8ec68a7e83d4b2e4ac31cf931f2d5d2866ba5b1d4037063e0e41e' 
  AND token = 'KRci5jOl88pdDObJEJQXSVG4Bkgt5hQtrk47HT8+0Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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