Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c1fd35ccddf7d10f9358f77a8b2cb3c5b838a7e1b7e3898e8c63d3742aab2a2' 
  AND token = '/l91WdLU0aNELlOSCdtU7Xpbf20NLG18SCHu8MJ9rGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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