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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8a23dc22422c81d4f330af0d26256dfbb7e9640ed2c7288a80a32b5540b5dbfa' 
  AND token = 'FzQvss2BALk36FffRgxQ+wp2a/8nWepiSQGvLgR5KW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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