Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ec8e51fe56b26b975bf0ec947a94a66f02940b46a8c86db9cf10b8f6800690' 
  AND token = 'Q2/Chc0qbBNBEBygwCXwDyU0dOa7idDOp8NzeZ0c7tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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