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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8134eeee1b325425eb3ddf37eace85a442e45eb26eb8399d93847f025b4ed350' 
  AND token = 'Rntgz05Z8iO9o5cWDawxaDXZ1IBhkF0bMiaYgkXahK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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