Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c842f831f6718d215894f73bdf8faa60607749c5239782d60552597c33f47ac' 
  AND token = 'u50OxUybGTwUfRWmlWJrzEWpNs5IzRdNkBRR3g3bIoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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