Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e6f3a06d348605da4322df7c0502135f7adc52e0a66b2803b8f0ce3bfd74c4e' 
  AND token = 'lMBkz3mwEHszBeODc1bFVet35PDlabRCegE/buinMFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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