Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80b5f379276ce1bde6527bbea4afd35f56f659e151adc66b8cb70a50e2c275cd' 
  AND token = 'RAcYuttMlpZG7wvjSOUtcDd7sQYidyO6Mjgx+zCBSvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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