Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6af34e4efbbcae3793bb9266a6be2f7bc8209b4928328a1fc13f780d9512021' 
  AND token = 'wKKM1V4TuAqEFhdQ8KpIJ6DfOx/OZb0HEqhtHvJ52UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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