Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b358de9bfa0e8427d4f4bf1bb7b857c36bb8af2404a0fe23e04c98b42b427867' 
  AND token = '6pOSWrKwT7OM7CEB9Btaw32A3ro0R0C5Tzjm0kTdqaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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