Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2538d98511c321e6cd62b13bfcc9f028e8ac229bb4a122a3ad10ed06c6acbe5e' 
  AND token = 'UQ/uUquUfT8pk8YwjyDcmYIGLzKulPlzZx1qX+coBDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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