Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb4dcb7934a846f6cc70fe8fcd9c13da4c0fabe147586955ce4d9e38b2ff40a' 
  AND token = 'jOpoTO/he+DJf7IoiJ/sLediAjueHgP0TOyl9rEIlRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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