Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd21809c822524dac0d7408adc9621f86d1d9e303320addc3911ee3056c282e82' 
  AND token = 'km/eDhm6mF8gpJFKbx+MepoJohSuWCn76t/+z9q1muo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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