Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75d87ff84aa408098aa6932586a006a6b7b885ed375f6cdd4f0af66da9ef4b9d' 
  AND token = 'OuLRZ8tGpp9tMUZ3CX4G0pq+Wb59fjtuc0RJBVh3Iok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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