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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '060804bebb538a2cb532e2414a041bc5894a990c080d649c930686c3fbe79bb8' 
  AND token = 'nj+NF5aO0ApIqqEJDkBcoLmC3Y5dU1UiK24Rzrv6azQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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