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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eb5d7c4cd0ec15015abb09ffb00b97767977d8740d8daa9a6da77c7d4a601aca' 
  AND token = 'mw+oIkHhzZuZS10XPGdufgQ5vqHq3WuidfdknXUQDnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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