Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec610807e82d777696451e5122f5b7b346f37b2e01d558b187ebca5251046771' 
  AND token = 'd2MZA/sQwSN0YpXJI02Gp2I/Nq/lKP/TzmGyHDbtUgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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