Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d98c1c29bdc78cb5bb1eb866e544979b82a8331c63779a4b85c8de83909dab' 
  AND token = 'BscTfpxfkFrftqo8jlb3P/MclFSJ3+hMnyvYr1hTeQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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