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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '68de3340e7d5621579539784cda195eb1b03267a094089b269060db64a906de2' 
  AND token = 'z/AlfSS7lAWnM+v4kI6F4aOTc7T9wjWLIhhSQ203FCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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