Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e04b7d7c3baac2dac473b7062774c7f794c89295e5b1f70b2fe9041dbc9dbb38' 
  AND token = 'EEHTmgwPEB3SDZv4SnkSIlM4+A87dAOsXtO9DBYAyTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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