Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6c3cacc751ad71261aa74cb68c19fb6cbac4a8cc0f816ae64e1a87dd2fc750' 
  AND token = 'p8lPO78s4hJMbWzSFylnmU/GezVAvf/lU+kUaTC9X6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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