Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03e088263dc79632ec672d14d645365eb65d8155eda26ad543317aa913faed0' 
  AND token = 'nXjaZWXmDbKsomovrFW1b+SIjMex/cPfFmh/xPsP4uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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