Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6846924eb935d6a5e27459d877cebc067b0bfe4baf52a0d05d8aee86e33aa6' 
  AND token = 'xaVeK00ZyrPojUxrKTf2CmkeGaOhsvt/BXxkKN7teRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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