Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '515f20ed6176fa886fa9e38776c08abf96b4fdeebfd3db232a7807ba5664ad62' 
  AND token = 'kXInGjW0SHbxnO5q+tDmnLxTfYCEg7s8kBiY/XgNE78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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