Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42dbce9a936798b52710d07479c21b59a3bd3df44fb2b2ae674eee3f2a8ecc72' 
  AND token = 'y0M20wk7Pa1FTqog2+751pDMRV1sJxoQH4HC3/n59k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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