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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e5ade6d57bfa071bfccb42165ae1ee1ef7ecf1eb1deef6076063850a48680bba' 
  AND token = 'rOWXg0uono1frpkNbMrEUPSQZLKyztyFoABrjxZw5mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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