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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2ed894f44eac241b65df2c3654580143fe98b46d7abccca820ddb91eac0d5b16' 
  AND token = 'f0YJjs3qWHyQMfQr3W2EFJ+snSdzitYI3CatXQ0dya0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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