Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7692cb4a4be4f665919e58dc8d76c6072be8a8492bab07c34dc98bcb360b9e' 
  AND token = 'oyV2y4ghc1cuuhVEcQWZtUhf+n5tVkbkqMYUtkNX0Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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