SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ba89fe2cef68c1d553af86d97f52a34bb570feba14d438e9787b81e4cd032b75' 
  AND token = 'C0VIIztZVwhX3PwuqOcTpf5OqG4IXgvUd/PIamrZc4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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