Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f02bf36a49f045e9d0f74bcfc2fa56f2d0a1d5c9b9c47ac8d15487624290fae' 
  AND token = 'T7PQy8jNbne6C+Gv2llESlnYIgb+A7yf6zpK11Pb3Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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